spark写orc格式文件
[*] 在hive中建表格式存储格式为orc
create table user(id int,name string) stored as orc;
[*] spark写文件
val jsons = "hdfs://localhost:9000/test/artist_orc.json"
val people = sc.textFile(jsons)
val schemaString = "id name"
val schema = StructType(schemaString.split(" ").map(fieldName => {if(fieldName == "name")
StructField(fieldName, StringType, true) else StructField(fieldName, IntegerType, true)}))
val rowRDD = people.map(line=>{
JSONObject.fromObject(line)
}).map(p => Row(new Integer(p.get("id").toString), p.get("name")))
val hiveContext = new org.apache.spark.sql.hive.HiveContext(sc)
val peopleSchemaRDD = hiveContext.createDataFrame(rowRDD, schema)
peopleSchemaRDD.write.format("orc").save("hdfs://localhost:9000/user/xb/warehouse/artist_orc/adf")
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